Issue 17538: Document XML vulnerabilties
diff --git a/Doc/library/markup.rst b/Doc/library/markup.rst
index 6782e39..0d05ef1 100644
--- a/Doc/library/markup.rst
+++ b/Doc/library/markup.rst
@@ -25,6 +25,7 @@
    htmlparser.rst
    sgmllib.rst
    htmllib.rst
+   xml.rst
    xml.etree.elementtree.rst
    xml.dom.rst
    xml.dom.minidom.rst